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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4541b50e75e79163db37467a70390b16762313cd5b2f3776b05a1adee02a9d8' 
  AND token = 'CHsr9BxTBQj+R+noYCucM5/tWDuSrQirtX7s8q0D28o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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