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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee4c764604a23802d5cb00eefce71765573f4c2d18f474d1a5e3c850b898274c' 
  AND token = 'OQtw2SIsOuL2f7ExMXq3RkZv5qNzeJlqBOi2OUFvw/0=' 
  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"
    }
  }
}