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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c39bc891a6a1b2bf662b6d6791aa5624e740a5d6b6bb0285b7ac5924f95467f' 
  AND token = 'ffetNk6usVfkaEhy7vveaQV+vbGUF6J+Ih+GjFbeRiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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