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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfc461acfedb6dbbc9508f6e6c5b5e9f2fc1cd2de4d48b327cb03684dcd566f8' 
  AND token = '8vlrVI7mR9zCcOwsssgOEVoXtT5kyv9XavaZ7BZJt5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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