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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04a208e98616533d195369532f41306630a604e98d73361b5ac55429d942d9a0' 
  AND token = 'dy7S7Ax6c1KQteuh/9N6iOQReVlFC/n8qWD0+goAa1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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