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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e833dc661271dc7fed0fcff6f4cbe88ad0db2b973665fed9cb06f4f2732a24c' 
  AND token = 'wMGm9PeO2c0+SeoR3cEOF/O0Umzp9P8GlEyHJzrWK5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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