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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '532a961afe2fa3e0a9caa63c9377f1bf1d858b3e4f500d8db84c6366e1fd9c83' 
  AND token = 'alJSYQa/SNvT//vZA8Bh+tWMia3snjO8FiBl+U2fVp8=' 
  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"
    }
  }
}