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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88aa879c00094769de8006a2a87da241ad7f98abd350bcf4c72483f3b5f27452' 
  AND token = 'Rjd1axPnAeh1DYuLQjYXPlZNenhXK21fqsG2pgoXMvA=' 
  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"
    }
  }
}