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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aee9dbc413c1f3143571e4744c04b6439b5e02bf52bcd366f210a7da860e408f' 
  AND token = 'f1iouFqhsn1YjEVi9Q2HXM6QaaUUNBgvRmx7wyFksBw=' 
  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"
    }
  }
}