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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebbde85acdd57f0568eba4dcb94677076c3d6ad355de92dd3b7c6b34400878bf' 
  AND token = 'LWmF4OLDCmli6otvdNb0bIU8i/t+h4Z81sT9B3/7QWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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