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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5814412535300e8f2f44b282d2e90f78fd6ae9ddeb20b0310e6fb9bed451a77' 
  AND token = 'PpBwbp6Nl2JIwlKv8H0M7Gunr59eHefOmN/rGAis47k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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