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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24baf2ba652e463841e5571c73a709438b3885bb98e230ef8feb70e0d0fb6c43' 
  AND token = 'kGhen79Vk9sx3v+MCmPqrVXpKirrnLQjSyjAcCEo7dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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