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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e3e58567a31ac0e23a572914748788f5b3643bb1cf311bc05c447463b84593d' 
  AND token = 'zzT7gqmIt6wczzjmvkNPZKMWkpmOtadRMEc6n7zmfpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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