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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70d6478263fa9dd98aaf57d7db42bb6756d3bbd9905f1d7ee6e6ed38d199c64e' 
  AND token = 'b8AimFVonS4czxV3p0UQ2175pmoYLhL9PkvFobWoOYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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