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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aebf355dbf6ff341e942acf71b2c06f65abe27186114708fd945082690b8a326' 
  AND token = 'KVyyLB1+hijiaRHcUpthmgEy2Qt1+406/pIcuP+y4pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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