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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6eebb73782aebcb5b69c430e5ac203fc34d91c5d2218431eae8f42e179a306e' 
  AND token = '2NBh3me+FGrYYJYRQGmpx9JJBiOGGf5z+uT1lb0EAWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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