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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd86a62eff7de37efc03c78016c9c79f7381469ff93f2418a2a84edb63c61ece5' 
  AND token = 'zIJlqXIWAkwTfWbPF4P9KQah/u5fLtPEy8yGMmb/y18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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