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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcc73a367490a94b9fe600b763f8b5b52bbbabc71e6e06f4491be17a09196a69' 
  AND token = '10hebWNMsLi5Fhl2XvM0whkdZuAI11wDO56tjkktWFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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