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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5a33517261dfac78e01efe2b56bdb8e12b01385c0023971f3937ff6c8795eb4' 
  AND token = '/XiUNEJlvsKuSJWCY2SmbK5G4ycRtdrBvfdaLRLYrNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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