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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd111bf9175a589ec7ab69bc149798f7d6feea721d09dd87383346c3c7de801e2' 
  AND token = 'aEfM+dSDsd5pemx+GbfGszXcUL2ttBdoryFQGDgDJ7M=' 
  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"
    }
  }
}