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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e93dc1c88e9be6ca7c8ff4b6839b6ecfa4d78b8b092eb79b7bbc769c3f1bb88d' 
  AND token = 'vhL+TH708+qEeVdcke2ZCED4M1t3Fau2F6ReJB+5IEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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