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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f27194bdc5ea79e1ade256c937c8499c6e313215066f8dc0c2e8f2bcd973495f' 
  AND token = 'EGyO27Ou2k1ggA4b/CaFsYE5tiIZyGCoc4PCo0hSryc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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