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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afd69f0af0ed2dda811865b6c3b78b16c3dfa28aaa5b5b0fda0999bc2ad5af37' 
  AND token = '9Ul/85zqH135yvXz3TPos8kKE1yHrlu2GRG6xRuAWeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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