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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1352a802c68287e7a2a6f2dc6c581b5b993a185adff4b28957631a21113d9a4' 
  AND token = 'XDOLm3nXsR2fuvdqx/4Et1UowtesldiYyfpIRfhR0Ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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