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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8970839b4b48aab082436e9dcad62687148dd3ebf981a0c3c8a0d8f997352b28' 
  AND token = 'AF3f/PrIkaEHBRs8vdTX7bCgk5DwyyJ+Un6VkGf34x8=' 
  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"
    }
  }
}