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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fde04cc097294ab2ea5ad00618ff3e560450f57816a8b65c5ba5cd8bebffd6bd' 
  AND token = 'nillWTgB2wCh1tjLjzjv68TIef7T0EZObtK+ih35FUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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