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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5534ec25b90ff26d468633e22183d7bf44472036f85c3c76d3bca63b309b8daa' 
  AND token = 'nVnNeP94Bq/LfxWozAFaWJ3CmhgnL9sF29hacAHNn9M=' 
  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"
    }
  }
}