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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d1e9e660edc15315e0a3f0bb0756ec4c563bbebcc4e1ba7adce435b4e946eeb' 
  AND token = 'LPGFsKcv4Z5WPrdyF2i66JaMbup1kL5O5RoZWdRLxS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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