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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff3d47eccf497c223e346d432b6c02f3081081e2a75d26e119c1c230b01703d8' 
  AND token = '23f1qtBjUF13G1pomZaoEtuict3ZXA9sRH1l9m3jPtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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