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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '614fb25302f559d3fd3ce493d22a63d6b2c7ec91e63c3e78f175fba81dcc2be3' 
  AND token = '81G8LC5Fj7Ke04BHRa2veVaNHyVJnJGdPlME+M3rzkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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