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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61a0a919d5b926056aacf7d707c3f848a5e41965780615c55a4607c3e7f56e71' 
  AND token = '5ksOm8Aa8wt/zbuToT7tZaKerv/j57AV2nZMtDDLOEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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