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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '519baecd6192a5cd4e84e10f8cd91d1a06b2836498a3aa5d956e9d42c93568b0' 
  AND token = 'h42Chc0wVlX33MPlQw8KvvEpVom/I0tZJwHletECf40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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