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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfe0f5d5a862e356f85eb859fdb24918f285b9244e1d6ba3e5dd8549c9408a56' 
  AND token = 'SYXl8No98gB9UH3MTTiyW/FH0pU+K0tLMuOm/IqHLp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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