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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fff404f8a6212cf44292b33e2b199ace5410f4373275b9ae99c39c9a97eb66c5' 
  AND token = 'uV1V+f4Zfc8wfPfejA4S9mtOroeN5+W5bY8qTVLsz+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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