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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46ef8f062920ceea0ce801c46f7287914b71b88170c417bcc0adf42ea4843c18' 
  AND token = 'wqu667fQCEd2x83s/EY0LWFYsEVum1aGk+nbXmwqYks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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