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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a3fd67866671d6e41453a65509c8a577c10591f10fe4b537f0582af268a75bf' 
  AND token = '+/55RnVnLf7YV5uJnzpVIiNZtvPTdqKU4/VEoNoO+oY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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