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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c141830ae9b886888139a6638bcb23b5b2337ccd23a08289d86867148e375d0' 
  AND token = '4XSDDTiPN33zrLuBMmvCirVk7hX6c7iMMfM4Qh0E04c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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