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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '232fcc0b3fd5fcb09ee8fbcb2491421dcd541f6f140f45253de830b1df4adc4e' 
  AND token = '891m+WK+iWv3KBdSbAMk0ddyrHjkUMsuwAUV+s0JD30=' 
  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"
    }
  }
}