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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffd6997d02da9e9b466f37ead7bbd4cf3c67e338cb187e6cd474e01e241cf4b6' 
  AND token = 'fUEerpHStJFudkcLmvbi/x7Xz1KYmxibUKhsF4RTCMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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