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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b570282e8f3ae8bff50cd20bf1f342003ff348d3111a4129f95f3dd8dbf7156' 
  AND token = 'PeaLNfYB0UsNVh8E07zhvtkjqldR5U6nsWOHZ1WPf2E=' 
  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"
    }
  }
}