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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6a95ebb17213d651c471af3bb32ba1aea0ff121a687a8a1723890cadd6da7a' 
  AND token = 'jGo3vPyhJJNHQ6pPcsHnxFoSw/Q3X8ui3Hc7F/1ApJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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