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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75c27af5fd1740463ea088220e64fac9df4c2a5f007bd17785b5da7ef1d5cb9e' 
  AND token = '0SbIQTQ33pj6bxkDo3pGQkRIfMk1Ve5iT6mMeH2furU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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