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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22f6dc674a7a7d5b7afeeef6fbad1f33768154a709f95ee4bd45af289b10df12' 
  AND token = 'glc+UGzQyUHv+bSj4D+OePmFuGKuFECj9Z8MERNdl2k=' 
  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"
    }
  }
}