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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61e8524594dfc8721404313a6bf85679f65a8e2c417a78d87e44a75b06db2f67' 
  AND token = 'pcm7K5kqN8FeftQAAdvyuPxmorjHK7RLBPHkU6sE+1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}