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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e1f02eac2c8358eaef68c4ca9fa902bc4e16d21a052dc6052c346c9f3244a77' 
  AND token = 'wdF/Mn7frzBSW7Bhkz+cLUUgVm/uMHSjnnASO+Y7Nwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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