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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fddbf9c891cbd2acd6e95a92e60757f4511ba32da1e1d849419eaf750fc69173' 
  AND token = 'O7PcTAYMTAH/1JERmpx1T88xTSonLJ+P9lEUL4vHAX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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