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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7144d767cb9b2972ded93344eea5e8975c7ad4cd24d560388e867ea1f8d42c3' 
  AND token = 'SvgUZlZC5BF7Urg+encf+GccjxO1e+L7dsKJwNrQ1rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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