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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1de89a0c681151b4b0d2c30fbc462b7cd9d029830fafc13c1168af0e2507efa' 
  AND token = 'bKsDOvphNC4vYmzmKFHdInERGMYtjd1xRU/ZpOkr318=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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