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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6b76519900546e690118240627c50e5608cdd689b43e3811c633c2e8ae69bc8' 
  AND token = '1io/LYQiYV/pShC9mOPyCEjxb/VZjF7F5hPvZEtsGzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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