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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56fe515bcaf9649893a2c02b996d0ac2711d30e01124d3101484d1181a42de0e' 
  AND token = 'S3XyOopXAL0LRkUd4JMGW+9rNKPOhWY8BiWKk00YHbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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