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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea7f0af644aa24a4c8cae86d0967dc350f1a6384e7e71fe65ff81d4c74daa012' 
  AND token = 'pe7/Z+YHKWH1bqPkr+RkdXOcOi3cQXPtUPW+xnfu5oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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