Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5c9444a11af9ac59aae38db87508c87b2f7926983c9baa8511aa2dd53f20653' 
  AND token = '8r01EmJT/hwcbd9PrSRYBiiv86A/2D150AzQYPDH2Ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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