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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '662b16c31e0cec52682a24f6d8495e7edefdf59e2e12702642d137a1ae002944' 
  AND token = 'EsT4FHVI3ITP+GQQGw7q13uZa3hhUWkWbf06L4zmZyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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