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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8ca6ab4b07b97b7c2d089e247c55464902505ab05802fc54d026f0e87e6c3de' 
  AND token = 'T+GZkn53gBMId3yUMCotIB35D0C+OTn8gkZqcazEv60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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