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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e611e820591aec2470e13011775e7d6e616cf9595f13f0604f3fd0e91253a351' 
  AND token = '9dMVjd0ldkgyYHQLIkMRaVnPjHWQc/iecr+z9GDAVts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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