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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f670a6b170ae38c9c13a78a43a3e21ed4dd7270f0fbac882a2cfa58d76c83f8e' 
  AND token = '5l7g6UOhnVmCS7O6Z48cRYMzggyqUnevokIlMBl+0ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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