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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac80ce3912952a8ef11d9ca1f8adaebcd5165dfff2467c166888cf9069ae44e1' 
  AND token = 'k4bvnbMnORSD5qSzUw2iEMUucfYbMzi/O5OMI9Tx+po=' 
  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"
    }
  }
}