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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abd45de35c6a32bf391569c2e3f30b287cc481528bb53a1030dc2169c0736410' 
  AND token = 'Jt8tgfPe50CYiVkbsrz2x3v2KeuAriM04G/5cTT4zTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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