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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5f4336a765312a16f07c4c90d6d5b33790dab736d81cb6b931c9ad5e5f20f92' 
  AND token = '+FBzJQUro01czQKSLEUdEUAAllJ8w7tXLc3sDr8rjf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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